Package Included:1 * CO2 Cylinder Refill Adapter Hose?36 inch hose?1 * Bag of fittings1 * user's manualSpecification:Hose material: Stainless steelHose length: 36 Inch/90cmWorking pressure: 3000 PSIThread For Large CO2 Tank: CGA320 G1/2-14Fits soda stream tank thread: TR21-4Instructions :a.Place the gasket in the connector,confirm the inlet valve and release valve are closed,rotating the pin switch of small cylinder adapter to the top.b.Connect the the big co2 tank.c.Connect the small cylinder.d.Rotate the pin switch of the adapter to the bottom to completely open the cylinder valve.e.open the inlet valve(the first valve from big tank,not the big tank handwheel).f.VERY SLOWLY open the handwheel of your big tank listening for a small hiss. When hissing stops, open a little more until it's all the way open.Wait about 30-60 seconds until you hear no gas flows, filling can be complete.(Please Refer to NOTE:)g.Once refilling is complete,stop the CO2 by turning the handwheel.h. Isolate the Soda Stream cylinder by rotating the pin switch to the top.i. Release the residual gas by opening the escape valve.j. Remove the small cylinder.j.Repeat the refill process for each cylinder